JP6601381B2 - Drilling device - Google Patents

Description

  The present invention relates to a punching device for punching punched holes in recording paper.

  As a punching device that punches punch holes in recording paper, a punching blade that punches punch holes in recording paper by vertical movement, a punching motor, and a vertical motion conversion unit that converts the rotation of the punching motor into vertical movement of the punching blade Are known (for example, see Patent Document 1).

  Usually, punching of a punch hole by a punching device is usually performed in a short time of several tens of ms, and thus involves a large load fluctuation. Therefore, as in Patent Document 1, a DC motor is often used as a drilling motor, but the DC motor has a large inertia. For this reason, even if a brake (short-circuit brake or reverse brake) is applied from a high-speed rotation state, it does not stop simultaneously with the brake, and it is difficult to rotate at inertia and stop at the reference position.

  Therefore, Patent Document 1 proposes a technique for changing a motor stop operation start position, that is, a timing for applying a brake, according to a motor drive amount for a predetermined time during motor drive.

JP 2004-345834 A

  However, since the degree of brake application varies depending on variations in DC motor component characteristics and temperature conditions, there is a problem that it is impossible to accurately stop the target reference position only by changing the brake application timing. . After stopping, it is necessary to move it again to the original target reference position, resulting in a decrease in productivity.

  This invention is made | formed in view of this point, The place made into the objective is to provide the perforation apparatus which can improve the stop precision to the target reference position.

The punching device according to the present invention includes a punching blade for punching punched holes in recording paper by vertical movement, a punching motor, and a vertical movement for converting the rotation of the punching shaft connected to the punching motor into vertical movement of the punching blade. A punching device that includes a dynamic conversion unit, and performs a punching process of punching a punch hole by rotating the drilling shaft from a reference position, and a brake process of braking the rotation of the drilling shaft and stopping the punching shaft at the reference position A rotation detection unit that detects rotation of the perforated shaft and outputs a rotation position signal; and a brake control unit that intermittently turns on and off the brake in the brake process. A brake period for turning on the brake according to a rotational position and a rotational speed of the drilling shaft measured based on the rotational position signal, Serial with the rotational position is determined long enough tends closer to the reference position, to determine the rotational speed is higher the faster increase trend, the rotational position signal, pulse output every time the drilling shaft rotates by a predetermined angle The brake control unit measures the rotational position of the drilling shaft by counting the pulses of the rotational position signal, and measures the rotational speed of the drilling shaft by the pulse period of the rotational position signal. A brake ratio calculation table in which the brake period in the pulse period is determined and a brake ratio according to the rotation position and the rotation speed is set, and the brake control unit refers to the brake ratio calculation table By multiplying the pulse ratio specified by To wherein there determining said brake period in the scan period.
Et al is, perforating apparatus of the present invention, by the brake process, the drilling shaft is a and determines the stop position determining section for determining whether or not stopped at the reference position, the drilling shaft is the reference by the stop position determining section When it is determined that the stop has occurred before the position, the brake ratio in the brake ratio calculation table is corrected to be smaller, and the stop position determination unit determines that the perforated shaft has stopped past the reference position. A table correction unit that corrects the brake ratio of the brake ratio calculation table in a direction of increasing.
Furthermore, in the punching device of the present invention, the table correction unit may uniformly increase or decrease the brake ratio of the brake ratio calculation table.
Furthermore, in the punching device of the present invention, the table correction unit may increase or decrease only the brake ratio corresponding to the slow rotation speed in the brake ratio calculation table.
Further, a post-processing apparatus of the present invention is a post-processing apparatus that receives recording paper and performs various post-processing, and includes the above-described punching device .
In addition, an image forming apparatus of the present invention includes a post-processing device including the above-described punching device, and an image forming device that outputs the recording paper on which an image is formed to the post-processing device.

  According to the present invention, it is possible to perform optimum speed attenuation according to the rotation position and the rotation speed in the brake processing, and it is possible to improve the stopping accuracy to the target reference position.

1 is a system configuration diagram illustrating a configuration of an image forming system including a post-processing apparatus and an image forming apparatus including an embodiment of a punching apparatus according to the present invention. It is a perspective view which shows the structure of the perforation apparatus shown in FIG. It is a perspective view which shows the structure of the rotation detection part and reference position detection part which are shown in FIG. It is a block diagram which shows schematic structure of embodiment of the punching apparatus which concerns on this invention. It is a figure which shows the example of a brake ratio calculation table shown in FIG. It is a wave form diagram for demonstrating the drilling process and brake process by embodiment of the drilling apparatus which concerns on this invention. It is a wave form diagram explaining the brake period calculation operation | movement in the brake process shown in FIG. It is a wave form diagram explaining the position correction operation | movement in the brake process shown in FIG.

  Next, embodiments of the present invention will be specifically described with reference to the drawings.

  Referring to FIG. 1, the image forming system according to the present embodiment receives an image forming apparatus 1 that records and outputs an image formed on a recording sheet, and a recording sheet that is output from the image forming apparatus 1 and receives the recording sheet. And a post-processing device 2 that executes various types of post-processing on the paper.

  The image forming apparatus 1 is an electrophotographic copying machine, an MFP (Multifunction Peripheral / Printer / Product), or the like, and includes a document reading unit 11, a document feeding unit 12, an image forming unit 13, and a recording paper supply. Part 14. The image forming apparatus 1 executes an image forming operation such as a copy job, a scan job, a facsimile transmission job, and a printer job based on an operation received while logged in by user authentication.

  The document reading unit 11 includes a light source that irradiates light on a document set on a document table or a document fed from the document feeding unit 12, and a photoelectric sensor such as a CCD that converts reflected light from the document into image data of the document. And a conversion unit.

  The image forming unit 13 forms a toner image based on the print data, transfers the formed toner image onto the recording paper conveyed from the recording paper supply unit 14, and fixes the toner image transferred onto the recording paper to a predetermined fixing level. Fix and record at temperature.

  The post-processing device 2 includes a punching device 3. Note that the post-processing device 2 may include a stapling device that stacks a plurality of recording sheets and binds them with staples, a middle folding device that folds the recording paper, and the like.

  Referring to FIG. 2, the punching device 3 is arranged at a predetermined interval in the width direction of the recording paper, and a punching blade 31 for punching punch holes in the recording paper by vertical movement, a punching motor 32, and a gear train. Are connected to the rotary shaft of the drilling motor 32 via the drilling shaft 33, the vertical movement converting unit 34 for converting the rotation of the drilling shaft 33 into the vertical movement of the drilling blade 31, the rotation detecting unit 4, and the reference position detection. Part 5.

  For example, the vertical motion conversion unit 34 engages the peripheral edge of the eccentric cam supported by the piercing shaft 33 with the support member that supports the piercing blade 31, thereby causing the piercing blade 31 to rotate. Move up and down. In this case, the perforation process for perforating punch holes is performed by engaging the peripheral edge far from the rotation center of the eccentric cam with the support member of the perforation blade 31 by the rotation of the perforation shaft 33. The peripheral position close to the rotation center of the eccentric cam engages with the support member of the punching blade 31, and the state where the punching blade 31 does not contact the recording paper is a reference position for standby for the next punching process.

  The rotation detection unit 4 is a detection unit for detecting the rotation of the drilling shaft 33 (eccentric cam). 2 and 3, the rotation detection unit 4 includes a pulse plate 41 attached to one end side of the perforated shaft 33, a rotation amount detection sensor 42 configured by a transmission type photo interrupter, and the like. It has.

  The pulse plate 41 is formed in a disc shape, and the perforated shaft 33 passes through the center (center). In the pulse plate 41, a plurality of slit holes 43 are formed so as to be evenly arranged over the entire circumference in the circumferential direction. The rotation amount detection sensor 42 is disposed at a position facing the rotation trajectory of the plurality of slit holes 43, and outputs a pulse corresponding to the presence or absence (passing or blocking) of the slit holes 43 as a rotation position signal. In the present embodiment, 36 slit holes 43 are formed in the pulse plate 41, and the rotation amount detection sensor 42 detects the 36 slit holes 43 every 10 degrees when the pulse plate 41 makes one rotation. To do. Thereby, the rotation position signal output from the rotation detection unit 4 becomes a pulse signal that outputs a pulse every time the drilling shaft 33 rotates 10 degrees.

  The reference position detection unit 5 is a detection unit for detecting the reference position of the drilling shaft 33 (eccentric cam). 2 and 3, the reference position detection unit 5 includes a reference position detection plate 51 attached to one end side of the drilling shaft 33, a transmission type photo interrupter, and the like. 52.

  The reference position detection plate 51 is formed in a disc shape, and the perforated shaft 33 passes through the center (center). The reference position detection plate 51 has a notch 53 for detecting the reference position. The notch 53 is formed over an angle corresponding to a plurality of slit holes 43 in the pulse plate 41. The reference position detection sensor 52 is arranged at a position facing the rotation locus of the notch 53, and outputs a pulse corresponding to the presence or absence (pass or block) of the notch 53 as a reference position signal. The reference position detection sensor 52 detects one pulse when the reference position detection plate 51 rotates once. In the present embodiment, the position where the two slit holes 43 are detected by the rotation amount detection sensor 42 after the notch 53 is detected by the reference position detection sensor 52 is set as the reference position.

FIG. 4 is a block diagram showing a schematic configuration of the punching device 3.
The punching device 3 includes a control unit 6, a motor power supply 7 that supplies power to the drilling motor 32, a storage unit 8, and a short-circuit switch 9 in addition to the above-described configuration.

  The control unit 6 is an information processing unit such as a microcomputer provided with a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), and the like. In the ROM, a control program for controlling the operation of the punching device 3 is stored. The CPU of the control unit 6 reads the control program stored in the ROM and develops the control program in the RAM, thereby controlling the entire apparatus. Further, the control unit 6 functions as a perforation control unit 61, a brake control unit 62, a stop position determination unit 63, and a table correction unit 64.

  The storage unit 8 is a storage unit such as a semiconductor memory or an HDD (Hard Disk Drive), and stores a brake ratio calculation table 81. As shown in FIG. 5, the brake ratio calculation table 81 is set with a brake ratio B corresponding to the rotational position and rotational speed of the drill shaft 33. The rotational position of the piercing shaft 33 is measured by counting pulses of the rotational position signal output from the rotation detector 4. Further, the rotational speed of the perforated shaft 33 is measured by measuring the pulse period T of the rotational position signal output from the rotation detector 4. The brake ratio B of the brake ratio calculation table 81 is set to have a tendency to increase as the rotational position approaches the reference position (36 counts) and to increase as the speed increases.

  The short-circuit switch 9 is a switch that short-circuits the terminal of the drilling motor 32 and applies a short-circuit brake.

  The perforation control unit 61 executes a perforation process for perforating punch holes by rotating the perforation shaft 33 from the reference position. When a drilling command is input from the host device, the drilling control unit 61 causes the motor power supply 7 to supply a positive voltage to the drilling motor 32 and starts the drilling process. Further, the punching control unit 61 starts counting pulses of the rotational position signal output from the rotation detection unit 4 with the start of the punching process. When the pulse count value reaches a preset value (19 counts in this embodiment), the punching control unit 61 stops the voltage supply from the motor power supply 7 to the punching motor 32, and the punching control unit 61 The process ends.

  The brake control unit 62 executes a brake process in which the rotation of the drilling shaft 33 is braked and stopped at the reference position. The brake control unit 62 determines a braking period in which the short-circuit brake is applied by turning on the short-circuit switch 9 according to the measured rotational position and rotational speed of the drilling shaft 33. In this embodiment, a short-circuit brake is used as a brake. However, a reverse brake that supplies a negative voltage from the motor power supply 7 to the drilling motor 32 may be used.

  First, the brake control unit 62 measures the rotational position of the drilling shaft 33 based on the pulse count value based on the rotational position signal output from the rotation detection unit 4, and measures the pulse period T, thereby measuring the rotation of the drilling shaft 33. Measure the rotation speed. Next, the brake control unit 62 specifies the brake ratio B according to the measured rotational position and rotational speed of the drilling shaft 33 by referring to the brake ratio calculation table 81 of the storage unit 8. Next, the brake control unit 62 calculates a value obtained by multiplying the measured pulse period T by the specified brake ratio B as a brake period. Thereby, the brake period is determined to tend to become longer as the rotational position approaches the reference position (36 counts), and to become longer as the speed increases.

  The stop position determination unit 63 determines whether or not the drilling shaft 33 has stopped at the reference position by the brake processing by the brake control unit 62. Then, when the drilling shaft 33 does not stop at the reference position, the stop position determination unit 63 supplies a positive or negative voltage from the motor power supply 7 to the drilling motor 32 to correct the rotational position of the drilling shaft 33. . The stop position determination unit 63 instructs the table correction unit 64 to correct the brake ratio calculation table 81 when the drilling shaft 33 does not stop at the reference position.

  The table correction unit 64 corrects the brake ratio B of the brake ratio calculation table 81 based on an instruction from the stop position determination unit 63.

Next, the drilling process and the brake process by the drilling device 3 will be described in detail with reference to FIGS.
The control unit 6 functions as the drilling control unit 61 when a drilling command is input from the host device. The punching control unit 61 starts the supply of a positive voltage from the motor power supply 7 to the punching motor 32 and starts executing the punching process. As a result, the perforation shaft 33 rotates and the peripheral edge far from the rotation center of the eccentric cam engages with the support member of the perforation blade 31 so that the perforation blade 31 is drawn out toward the recording paper and the punch hole is perforated. .

  Further, the punching control unit 61 starts counting pulses of the rotational position signal output from the rotation detection unit 4 with the start of the punching process. When the count value of the pulses reaches 19 counts, the punching control unit 61 stops the voltage supply from the motor power supply 7 to the punching motor 32 and ends the punching process.

The control unit 6 functions as the brake control unit 62 when the drilling process by the drilling control unit 61 is completed. The brake control unit 62, as shown in FIG. 7, on the basis of the rotational position signal output from the rotation detecting unit 4, together with measuring the rotational position of the drilling shaft 33 by a pulse count value A, measured pulse period T _A As a result, the rotational speed of the perforated shaft 33 is measured.

Next, the brake control unit 62 refers to the brake ratio calculation table 81 in the storage unit 8 for the measured rotation position and rotation speed of the drilling shaft 33, that is, the brake ratio B _A corresponding to the count value A and the pulse period T _A. To identify.

Next, the brake control unit 62 calculates a value (T _A × B _A ) obtained by multiplying the measured pulse period T _A by the specified brake ratio B _A as a brake period in the pulse period T _{A + 1} of the next count value A + 1. To do.
Then, the brake control unit 62 applies the short-circuit brake by turning on the short-circuit switch 9 only during the calculated brake period (T _A × B _A ) in the next pulse period T _{A + 1} of the count value A + 1. Thereby, in the pulse period T _{A + 1} of the count value A + 1, the terminal of the punching motor 32 is opened during the non-brake period {pulse period T _{A + 1} −brake period (T _A × B _A )} in which the short-circuit switch 9 is turned off. The perforated shaft 33 rotates by inertia.

  Thereafter, in the brake process, the brake period and the non-brake period are repeated, and the short-circuit switch 9 is intermittently turned on / off. Thereby, in the brake process, the short-circuit brake is intermittently applied, and the perforated shaft 33 can be accurately stopped at the reference position by the optimum speed attenuation.

  Next, the control unit 6 functions as the stop position determination unit 63 and determines whether or not the drilling shaft 33 has stopped at the reference position by the brake process.

As shown in FIG. 8A, the stop position determination unit 63 detects that the notch 53 is detected by the reference position detection sensor 52 and the reference position signal becomes high level. If the slit position 43 is detected, the rotational position signal rises twice, and the fall of the next rotational position signal is not detected even after the preset time period T ₀ has elapsed, the drilling shaft 33 is moved to the reference position. It is determined that the drilling has stopped, and the drilling operation is terminated.

As shown in FIG. 8B, the stop position determination unit 63 detects that the notch 53 is detected by the reference position detection sensor 52 and the reference position signal becomes high level. When the elapsed period T ₀ has elapsed before the slit position 43 is detected and the rotational position signal rises twice, it is determined that the perforated shaft 33 has stopped before the reference position, and the rotational position of the perforated shaft 33 is determined. To correct. When the drilling shaft 33 stops before the reference position, the stop position determination unit 63 intermittently applies a positive voltage (+ V) from the motor power supply 7 to the drilling motor 32 until the drilling shaft 33 reaches the reference position. To supply.

As shown in FIG. 8C, the stop position determination unit 63 detects that the notch 53 is detected by the reference position detection sensor 52 and the reference position signal becomes high level. When more than one slit hole 43 is detected, the rotational position signal rises twice, and the fall of the next rotational position signal is detected before the elapsed period T ₀ elapses, the drilling shaft 33 passes the reference position. The rotation position of the drilling shaft 33 is corrected. When the drilling shaft 33 stops past the reference position, the stop position determination unit 63 intermittently applies a negative voltage (−V) from the motor power supply 7 to the drilling motor 32 until the drilling shaft 33 returns to the reference position. To supply.

  The stop position determination unit 63 instructs the table correction unit 64 to correct the brake ratio calculation table 81 when the drilling shaft 33 does not stop at the reference position.

  The table correction unit 64 corrects the brake ratio B of the brake ratio calculation table 81 to be smaller when the drilling shaft 33 stops before the reference position, and when the drilling shaft 33 stops past the reference position, the brake is corrected. The brake ratio B in the ratio calculation table 81 is corrected so as to increase.

  An example of a method for correcting the brake ratio B is to increase or decrease the brake ratio B in the brake ratio calculation table 81 uniformly (a predetermined ratio or a predetermined value). In this case, the specified brake ratio B may be increased or decreased uniformly without changing the brake ratio calculation table 81 itself. In the brake ratio calculation table 81 shown in FIG. 5, the maximum value of the brake ratio B is 100%, but the brake period calculated by the brake ratio B is that of the next pulse period T that has been decelerated. The brake ratio B can be set to 100% or more.

  Another example of the method for correcting the brake ratio B is to increase or decrease only the brake ratio B corresponding to the slow rotation speed in the brake ratio calculation table 81. In this case, the stop position of the drilling shaft 33 can be controlled in a narrower range.

As described above, according to the present embodiment, the rotation of the perforation blade 31 that perforates punch holes in the recording paper by the vertical movement, the perforation motor 32, and the perforation shaft 33 connected to the perforation motor 32 is performed. A vertical movement conversion unit 34 for converting the vertical movement of the drilling blade 31, a punching process for punching a punch hole by rotating the drilling shaft 33 from the reference position, and braking the rotation of the drilling shaft 33 to the reference position. A drilling device 3 that executes a brake process for stopping, a rotation detection unit 4 that detects the rotation of the drilling shaft 33 and outputs a rotation position signal, and a brake control unit that intermittently turns on and off the short-circuit brake in the brake process 62, and the brake control unit 62 is arranged in accordance with the rotational position and rotational speed of the drilling shaft 33 measured based on the rotational position signal. The brake period for turning on, the rotational position is determined long enough tends to approach the reference position is determined on long enough it tends rotational speed increases.
With this configuration, it is possible to perform optimum speed attenuation according to the rotation position and the rotation speed in the brake processing, and it is possible to improve the stop accuracy to the target reference position.

Furthermore, according to the present embodiment, the rotation position signal is a pulse signal that is output every time the drilling shaft 33 rotates by a predetermined angle, and the brake control unit 62 performs drilling by counting the pulses of the rotation position signal. the rotational position a of the shaft 33, the rotational speed of the drilling shaft 33 are respectively measured by the pulse period T _a of the rotational position signal, determines a brake period in the next pulse period T _{a + 1.}
With this configuration, the optimum brake period in the next pulse period T _{A + 1} can be determined for each pulse period T _A of the rotational position signal, and precise speed attenuation can be performed.

Furthermore, according to the present embodiment, the brake ratio calculation table 81 in which the brake ratio B according to the rotation position and the rotation speed is set is provided, and the brake control unit 62 refers to the brake ratio calculation table 81. By multiplying the specified brake ratio B _A by the pulse period T _A , the brake period (T _A × B _A ) in the next pulse period T _{A + 1} is determined.
By this configuration, it is possible in accordance with the pulse period T _A to determine the braking period (T _A × B _A) in the next pulse period T _{A + 1,} it is possible to perform a more precise speed damping.

Furthermore, according to the present embodiment, the stop position determination unit 63 that determines whether or not the drilling shaft 33 has stopped at the reference position by the brake process, and the stop position determination unit 63 causes the drilling shaft 33 to be in front of the reference position. If it is determined that the perforated shaft 33 has stopped past the reference position, the brake position B of the brake ratio calculation table 81 is corrected so as to decrease. And a table correction unit 64 that corrects the brake ratio B of the ratio calculation table 81 in the increasing direction.
With this configuration, large variations in the braking force of the perforation motor 32 due to the environment and deterioration can be corrected.

Furthermore, according to the present embodiment, the table correction unit 64 uniformly increases or decreases the brake ratio B of the brake ratio calculation table 81.
With this configuration, it is possible to cope with this by increasing or decreasing the specified brake ratio B uniformly without changing the brake ratio calculation table 81 itself.

Furthermore, according to the present embodiment, the table correction unit 64 increases or decreases only the brake ratio B corresponding to the slow rotation speed in the brake ratio calculation table 81.
With this configuration, the stop position of the drilling shaft 33 can be controlled in a narrower range.

  It should be noted that the present invention is not limited to the above-described embodiments, and it is obvious that each embodiment can be appropriately changed within the scope of the technical idea of the present invention.

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 2 Post-processing apparatus 3 Punching device 4 Rotation detection part 5 Reference position detection part 6 Control part 7 Motor power supply 8 Storage part 9 Short-circuit switch 11 Original reading part 12 Original feeding part 13 Image forming part 14 Recording paper supply Unit 31 Punching blade 32 Punching motor 33 Punching shaft 34 Vertical motion conversion unit 41 Pulse plate 42 Rotation amount detection sensor 43 Slit hole 51 Reference position detection plate 52 Reference position detection sensor 53 Notch unit 61 Punch control unit 62 Brake control unit 63 Stop position determination unit 64 Table correction unit 81 Brake ratio calculation table

Claims (6)

A punching blade that punches punch holes in the recording paper by vertical movement, a punching motor, and a vertical motion conversion unit that converts rotation of a punching shaft connected to the punching motor into vertical movement of the punching blade; A drilling device that performs a punching process of rotating the drilling shaft from a reference position to punch a punch hole, and a brake process of braking the rotation of the drilling shaft and stopping at the reference position,
A rotation detector that detects rotation of the drilling shaft and outputs a rotation position signal;
A brake control unit that intermittently turns on and off the brake in the brake processing,
The brake control unit lengthens a brake period for turning on the brake as the rotational position approaches the reference position, according to the rotational position and rotational speed of the drilling shaft measured based on the rotational position signal. Determine the tendency and determine the tendency to become longer as the rotational speed increases ,
The rotational position signal is a pulse signal that outputs a pulse every time the drilling shaft rotates by a predetermined angle,
The brake control unit measures the rotational position of the drilling shaft by counting the pulses of the rotational position signal, and measures the rotational speed of the drilling shaft by the pulse period of the rotational position signal, and the brake in the next pulse period. Determine the period,
A brake ratio calculation table in which a brake ratio according to the rotation position and the rotation speed is set;
The punch control unit, wherein the brake control unit determines the brake period in the next pulse period by multiplying the pulse period by the brake ratio specified with reference to the brake ratio calculation table. apparatus. A stop position determination unit that determines whether or not the perforated shaft has stopped at the reference position by the brake processing;
When it is determined by the stop position determination unit that the perforated shaft has stopped before the reference position, the brake ratio of the brake ratio calculation table is corrected in a decreasing direction, and the stop position determination unit performs the drilling shaft. If but it is determined to have stopped past the reference position, according to claim 1 wherein there by comprising a table correction unit that corrects the direction of increasing the braking ratio of the brake ratio calculation table Drilling device. The punching device according to claim 2 , wherein the table correction unit uniformly increases or decreases the brake ratio of the brake ratio calculation table. The punching device according to claim 2 , wherein the table correction unit increases or decreases only the brake ratio corresponding to the slow rotation speed in the brake ratio calculation table. In a post-processing device that accepts recording paper and performs various post-processing,
The post-processing apparatus provided with the punching apparatus in any one of Claims 1 thru | or 4 . A post-processing apparatus according to claim 5 ;
An image forming apparatus that outputs the recording paper on which an image has been formed to the post-processing device;
An image forming system comprising:

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